
with \(C_\text{SM} = 1\)  and \(\Gamma ^\mu = \gamma ^\mu P_L\)  in the SM, where \(G_F\) , \(V_{qb}\) , and \(P_{L/R}\)  denote the Fermi coupling constant, the Cabibbo-Kobayashi-Maskawa [1]}, [2]} (CKM) matrix element, and chiral projection operators \((1\mp \gamma _5)/2\) , respectively.
Throughout this paper, \(l\)  indicates all the charged leptons (\(l=e,\mu ,\tau \) ), whereas \(\ell \)  represents the light charged leptons (\(\ell = e,\mu \) ).
Then, the NP effect in the Wilson coefficient (WC) \(C_\text{NP}\) , with an arbitrary Lorenz structure \(\Gamma \) , can be analyzed from the \(B\)  decay observables.
